[mythtv] Problem with severe video jitter in current MythTv CVS

Terry Barnaby terry1 at beam.ltd.uk
Sun Dec 5 15:51:04 UTC 2004


Hi,

I have just updated my system to use the MythTv from CVS on
3/12/04 and am now experiencing severe display jitter. about once
per second the video display jumps. Previously I was using MythTv
from CVS 21/11/04 and everything was fine. Going back to this version 
cures the problem.

My system is a diskless Via M10K box using the vldXvMC hardware MPEG
output, although the problems also is apparent with standard Xv
output as well. The system ends up by using the DRM VSync which is
running at 50Hz. I have enabled de-interlace although with this switched
off the problem still exists.

Has anyone any ideas on what has changed between the CVS dates that
could cause this and any ideas on where to look in the code to fix it ?

I have the following output when using the "mythtv" program:

mythtv /home/terry/tvTest/interlace_test1.mpeg
mythtv: could not open config file /root/.mythtv/lircrc
mythtv: No such file or directory
Failed to read lirc config /root/.mythtv/lircrc for mythtv
2004-12-05 15:40:36.078 Joystick disabled.
2004-12-05 15:40:36.830 Connecting to backend server: 192.168.2.1:6543 
(try 1 of 5)
2004-12-05 15:40:36.839 Using protocol version 14
ERROR: couldn't find recorder for in-prog2004-12-05 15:40:36.863 Using 
protocol version 14
ress recording
2004-12-05 15:40:36.941 AVFD
2004-12-05 15:40:36.942 AVFD: Opening Stream #0: codec id 2
2004-12-05 15:40:36.943 detectInterlace(Detect Scan, Detect Scan, 25, 
576) ->Interlaced Scan
2004-12-05 15:40:36.943 Interlaced: Interlaced Scan  video_height: 576 
fps: 25
2004-12-05 15:40:36.950 AVFD: Looking for decoder for 4
2004-12-05 15:40:36.951 AVFD
2004-12-05 15:40:36.951 AVFD: Opening Stream #1: codec id 86020
2004-12-05 15:40:36.952 AVFD: Looking for decoder for 86020
2004-12-05 15:40:36.958 Initializing audio parms from stream #0.
2004-12-05 15:40:36.961 Estimated bitrate = 128000
2004-12-05 15:40:36.968 SyncPositionMap prerecorded, from DB: 0 entries
2004-12-05 15:40:36.981 Opening audio device '/dev/dsp'.
2004-12-05 15:40:36.982 Opening OSS audio device '/dev/dsp'.
2004-12-05 15:40:37.022 Over/underscan. V: 0, H: 0, XOff: 0, YOff: 0
Using XvMC version: 1.0
2004-12-05 15:40:37.036 XvMCSurfaceTypes::find(w 720, h 1, c 0, i 2, m 
0,sw 0, sh 56, disp, p<= 56, 5760 <=p, port, surfNum)
2004-12-05 15:40:37.037 Trying XvMC port 56
2004-12-05 15:40:37.038 Found a suitable XvMC surface 0
XvMC found and using VLD surface
2004-12-05 15:40:37.039 Using XV port 56
2004-12-05 15:40:37.072 Image size. dispxoff -120, dispyoff: 18, 
dispwoff: 960, disphoff: 540
2004-12-05 15:40:37.074 Image size. imgx 0, imgy: 0, imgw: 720, imgh: 576
2004-12-05 15:40:38.030 Changing from None to WatchingRecording
2004-12-05 15:40:38.032 Using realtime priority.
2004-12-05 15:40:38.042 XvMC will use bob deinterlacing
2004-12-05 15:40:38.043 Using deinterlace method bobdeint
2004-12-05 15:40:38.044 nVidiaVideoSync: Could not open device 
/dev/nvidia0, No such file or directory
2004-12-05 15:40:38.057 positionMap[ 0 ] == 2062.
2004-12-05 15:40:38.078 Using audio as timebase
2004-12-05 15:40:38.078 Video timing method: DRM
2004-12-05 15:40:38.078 Refresh rate: 16650, frame interval: 40000
2004-12-05 15:40:38.097 waiting for prebuffer...
2004-12-05 15:40:38.408 prebuffering pause
2004-12-05 15:40:38.408 waiting for prebuffer...
2004-12-05 15:40:38.608 A/V diverged by -3.0584 frames, dropping frame 
to keep audio in sync
2004-12-05 15:40:38.610 positionMap[ 1 ] == 55310.
2004-12-05 15:40:38.848 prebuffering pause
2004-12-05 15:40:38.848 waiting for prebuffer...
2004-12-05 15:40:38.968 A/V diverged by -3.06585 frames, dropping frame 
to keep audio in sync
2004-12-05 15:40:39.288 prebuffering pause
2004-12-05 15:40:39.288 waiting for prebuffer...
2004-12-05 15:40:39.304 HandleGopStart: gopset not set, syncing positionMap
2004-12-05 15:40:39.308 SyncPositionMap prerecorded, from DB: 2 entries
2004-12-05 15:40:39.308 Stream initial keyframedist: 15.
2004-12-05 15:40:39.309 detectInterlace(Ignore Scan, Interlaced Scan, 
25, 576) ->Interlaced Scan
2004-12-05 15:40:39.309 Interlaced: Interlaced Scan  video_height: 576 
fps: -1
2004-12-05 15:40:39.320 XvMC will use bob deinterlacing
2004-12-05 15:40:39.321 Using deinterlace method bobdeint
2004-12-05 15:40:39.321 positionMap[ 2 ] == 114702.
2004-12-05 15:40:39.428 A/V diverged by -3.03548 frames, dropping frame 
to keep audio in sync
2004-12-05 15:40:39.748 prebuffering pause
2004-12-05 15:40:39.748 waiting for prebuffer...
2004-12-05 15:40:39.788 positionMap[ 3 ] == 174094.
2004-12-05 15:40:39.868 A/V diverged by -3.14925 frames, dropping frame 
to keep audio in sync
2004-12-05 15:40:39.868 A/V diverged by -3.06192 frames, dropping frame 
to keep audio in sync
2004-12-05 15:40:40.208 prebuffering pause
2004-12-05 15:40:40.208 waiting for prebuffer...
2004-12-05 15:40:40.568 prebuffering pause
2004-12-05 15:40:40.568 waiting for prebuffer...
2004-12-05 15:40:40.568 positionMap[ 4 ] == 233486.
2004-12-05 15:40:40.928 prebuffering pause
2004-12-05 15:40:40.928 waiting for prebuffer...
2004-12-05 15:40:41.048 positionMap[ 5 ] == 294926.
2004-12-05 15:40:41.288 prebuffering pause
2004-12-05 15:40:41.288 waiting for prebuffer...
2004-12-05 15:40:41.648 prebuffering pause
2004-12-05 15:40:41.648 waiting for prebuffer...

Cheers


Terry



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